909749939 has 4 divisors (see below), whose sum is σ = 1039714224. Its totient is φ = 779785656.

The previous prime is 909749933. The next prime is 909749941. The reversal of 909749939 is 939947909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 909749939 - 2⁸ = 909749683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (909749933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64982132 + ... + 64982145.

It is an arithmetic number, because the mean of its divisors is an integer number (259928556).

Almost surely, 2^909749939 is an apocalyptic number.

909749939 is a deficient number, since it is larger than the sum of its proper divisors (129964285).

909749939 is a wasteful number, since it uses less digits than its factorization.

909749939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129964284.

The product of its (nonzero) digits is 4960116, while the sum is 59.

The square root of 909749939 is about 30162.0612525073. The cubic root of 909749939 is about 968.9633375233.

The spelling of 909749939 in words is "nine hundred nine million, seven hundred forty-nine thousand, nine hundred thirty-nine".